A method of video processing includes deriving, for a conversion between a chroma block of a video and a bitstream representation of the video, parameters of a cross-component linear model by using downsampled luma samples that are generated from N above neighboring lines of a collocated luma block of the chroma block using a downsampling filter, where N is a positive integer; and performing the conversion using a predicted chroma block generated using the cross-component linear model.
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2. The method of claim 1, wherein in response to the chroma block having a color format of 4:2:2, a second above neighbouring line of the collocated luma block is excluded from being used to derive the downsampled neighbouring top luma samples.
3. The method of claim 1, wherein in response to the chroma block having a color format of 4:2:2, a same downsampling filter is used to derive the downsampled neighbouring top luma samples regardless of whether the chroma block is at the top coding tree unit boundary or not.
4. The method of claim 3, wherein in response to the chroma block being at the top coding tree unit boundary, the downsampled neighbouring top luma samples are derived based on the nearest above neighbouring line of the collocated luma block.
7. The method of claim 6, wherein the same filter coefficients are [1 2 1].
8. The method of claim 1, wherein a first syntax element specifying a maximum block size used for a transform skip mode is conditionally included in the bitstream based on a value of a transform skip enabled flag included in a sequence parameter set in the bitstream.
9. The method of claim 1, wherein the conversion includes decoding the video from the bitstream.
10. The method of claim 1, wherein the conversion includes encoding the video into the bitstream.
12. The apparatus of claim 11, wherein in response to the chroma block having a color format of 4:2:2, a second above neighbouring line of the collocated luma block is excluded from being used to derive the downsampled neighbouring top luma samples.
13. The apparatus of claim 11, wherein in response to the chroma block having a color format of 4:2:2, a same downsampling filter is used to derive the downsampled neighbouring top luma samples regardless of whether the chroma block is at the top coding tree unit boundary or not.
14. The apparatus of claim 13, wherein in response to the chroma block being at the top coding tree unit boundary, the downsampled neighbouring top luma samples are derived based on the nearest above neighbouring line of the collocated luma block.
17. The apparatus of claim 16, wherein the same filter coefficients are [1 2 1].
20. The apparatus of claim 11, wherein a first syntax element specifying a maximum block size used for a transform skip mode is conditionally included in the bitstream based on a value of a transform skip enabled flag included in a sequence parameter set in the bitstream.
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April 29, 2022
November 8, 2022
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